Severe fog caused by an ongoing cold wave is disrupting flight operations in Delhi and various northern Indian cities. Numerous flights at Delhi's Indira Gandhi International Airport faced disruptions, leaving passengers stranded. Visibility at the airport was between 50 and 100 meters from 12.30 am to 6.30 am, leading to delays and cancellations.

Passengers expressed frustration, with one stating, "I have come from Dubai. My flight was delayed due to fog." The Indian Meteorological Department (IMD) predicts dense to very dense fog and continued cold conditions over North India for the next four days. Severe cold wave conditions are expected in the plains of northwest India, particularly in Punjab, Haryana, and Chandigarh on January 20 and 21.

Uttarakhand, Rajasthan, Bihar, Uttar Pradesh, Haryana, and Punjab are anticipated to experience dense to very dense fog in the next two days, posing challenges to transportation, especially rail travel. The meteorological office classifies visibility levels, with extremely dense fog causing disruptions when visibility is between 0 and 50 meters.